four years after he first took the oath of office, president barack obama set to do it again in just hours. one day before the public event. this, after a first-term marked by great triumphs >>> the united states has conducted an operation that killed osama bin laden. >> some setbacks. >> the bleakest unemployment in 26 years. >> big fights and deep sorrow. >> the majority of those who died today were children. beautiful little kids between the ages of 5 and 10 years old. >> now, as barack obama prepares to begin his second term and washington, d.c. prepares for another presidential inauguration, we look ahead to the opportunities and the challenges facing the nation today, sunday, january 20th, 2013. >>> from nbc news, this is a special edition of "today," "the second inauguration of barack obama" with lester holt and erica hill. live from washington, d.c. >>> welcome to a special edition of "today" on this sunday morning. i'm erica hill. >> i'm lester holt. beautiful morning in washington, d.c. happy to have jenna and dylan here with us as well. based on the picture i saw on twitte